My setup

1 Gal pots
600 HPS on a track(short track but it helps prevent burning)
4'wide x 5' long x 4??H (32? to the hood of the light)
85F ambient temp
35-45 humidity
Constant low lvl CO2 bleed with steady venting (Not a fill and purge cycle)

Likely root bound yes, but I am trying to stunt them slightly because my space is limited. I use a light hydroponics solution because I figure they ARE root bound and need the complete span of nutrients.

With all that power in such a small space am I just going to have to concede that this will happen from time to time?